three-pole single-throw switch

例句：

1. 1. The new three-pole single-throw switch has greatly improved the efficiency of our factory.
   这款新的三极单掷开关极大地提高了我们工厂的效率。
2. 2.The technician replaced the old three-pole single-throw switch with a more efficient model.
   技术人员用一个更高效的模型替换了旧的三极单掷开关。
3. 3.During maintenance, the technician found that the three-pole single-throw switch was faulty and needed to be replaced.
   在维护期间，技术人员发现三极单掷开关有故障，需要更换。